Malicious PDF — malware analysis report

Static analysis result for SHA-256 271a60fc60fdd3a0…

MALICIOUS

PDF

1.17 MB Created: 2009-12-17 03:14:38 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0.5 (Windows))
MD5: 0732b463d11f8b07891240dbe2b3992c SHA-1: ac375f280ba11974e8d026db0bff83ecb7cba014 SHA-256: 271a60fc60fdd3a03fb657205a078eee90ff3c8303d9f8cc900786396c7a43b7
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer property. This JavaScript is designed to be concatenated and evaluated, indicating an attempt to execute arbitrary code. The primary function of the script appears to be downloading and executing a second-stage payload from a remote source, though the exact URL is not directly extractable from the provided evidence. The presence of JavaScript actions and embedded JS streams strongly suggests a malicious intent to exploit this known vulnerability.

Heuristics 5

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js
67d16badf36b4d8c67c0c47adb9f01a2eaa60fa09fbb30364a16791a02d36c18		 pdf-javascript-stream PDF /JS object 31 at offset 0x12B202 4833 bytes
js_property_alias_stage_000.js
774794197013f344e9dcaa480d7ae7004565e7b8ad3db5b6b587afd1fc4ee26a		 deobfuscated-js JavaScript hex-escape property alias normalized stage at offset 0x12B202 4620 bytes

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